Which of the following factors account for the traffic on Africa rivers? 1. Availability of cheaper means of transport 2. Seasonal fluctuations of river flow. 3. Pressure of water falls and rapids. 4. Rivers flowing through sparsely populated areas.
-
A.
1 and 2 -
B.
2 and 3 -
C.
1 and 4 -
D.
3 and 4